/Engine/Source/Runtime/Engine/Classes/Kismet/BlueprintMapLibrary.h
Adds a key and value to the map. If something already uses the provided key it will be overwritten with the new value. After calling Key is guaranteed to be associated with Value until a subsequent mutation of the Map.
static void Map_Add ( const [TMap](API\Runtime\Core\Containers\TMap)< int32, int32 > & TargetMap, const int32 & Key, const int32 & Value )